Armored conductor.



Patented Aug E. D. SPEBR.

ARMORBD CONDUCTOR.

APPLIOAUON HLBDJUNE 27, 1908.

To all whom' it may comemf EipwAnn D. senile, oF'Ni-:W Yorin, N.

Amelie@ GONDUQTQR it known tliotv I, IErm/'Ano D. Sienna, a citizen of the United. States of Americ'nd Y, a resident .of the' city, of 1vNew York, State "and county` of New York, have invented certain neiir *and 'iiseiil Improvements in Armored Conductors, of which thel follow;

ing is a specification.. l

This invention relates` to improvements' in armored conductors, by "which term is meant properl7 insulated electric cor'idctors having metallic sheatlis outside the insulation to protect said insulation frominjury.

Some elfectivedineans of protecting the in-l siilation of electric conductors from nocidental injuries, such as the driving of nails, gnawing .of rodents, and other injuries, is now recognized to be of `greet importance Ain the electric Wiring "of buildings, ships and other structures; forexperience shows that the insulation' islinble to inji'iry from manyx causes iinless properly protected, and that fres'are liable to ocourbeciiiise or" ythe iiijury to the insulation; und it is not vtoo iniich to say that, in the view of the iinderwriters, proper protection of the insulation of cleo tric conductors is one ofthe most important matters in practical electrical installation.

The present invention aims vto 'provide :ii

conductor withl adequateprotection for tllie insulation, within reasonable limits of cost,

. and having the necessary flexibility to per mitotl all requisite ciiivzitiiresof the electric conductors when being installed.

The :ii-mor consists essentially of two spiral inetiil strips inclosiiig and'protecting the insulated conductor.,- iind forming one therewith, the 'outer in'etii-l strip covering` and closing the joints of @the inner metal strip; .sind it is tlie essential feature of this invention .that erich strip shall be so curvedor corrugiiteffl that tlie outer strip willlieve zi 'true and smooth working'fit on the corriigution ot" the inner strip; so esito-'Work smoothly thereon when the conductor is deflected, ivit-lioiit scraping orvciitting either strip. The fit of the outer upon the .inner strip is so smooth ondtriie, tliet l term it si i lmll bearing fit, thereby indicating that the two strips t each other 'and move rele.- tivcly to eiicli other with inncli of tlie smoothness of e bell in its loeiiring.v4 :The aforesaid siiiootli und true lit of the strips one on the other is especially advantageous when tlio seid sti-ips :ire galvanized, Wli'icli is" now tlic onse' with priwticiiily all :iriiiorel provided `bet-Ween adjacent edges-z of seiilstrip, to per- CQnduwrSJ-Sne expriericefhes '.Slwiivn the@ the gelvenizing 1s 'necessary to prevent the ,riisting lend deterioretion of 't-lie armor. lVlien however, tlieisaid strips are gallvanf the other ,iS indispensable@ prevent 'injury i tpl-,lie gallviinizifn'g' .froin'tlie striPS .Scratching i 0r Cutting 'the ea f m019Y-Ie-CSS time in this art lili-is" invention s :itisfiesv i p 'conditions' 2 l l. 7o Ast n. e ion is not limited to any precie C iature of tl'lestrpe it .can lmmfty be embodied in stiin .f rarioiis Cillv'atlffs, i that the fit lorfftllie oiiltei' lstri-piip"` n the inner is'sinooth'end'trneond therefore I illiistrat'e in the dreivipgs ivliicba-ccfome pan the: 'specification fandlhereir'witter de# scrilie severfil inodil'ictionsfor. ythe ,siiid strips, all embodyingm'y. said invention 'p Referring to the said dren/ings tofiiid `the description, Figure l'is 'e broken elevation ofen 'armored conductor with oneiorin orf the invention; Figi is "u broken section'and elevaition of 'the' seme, pzirticiiliirlyfilliis-A. treting the strips oftheferinor.iiil sect sind Fig-.'23 is ,zi broken lsectionA and elevation or" an nriiioied .conductor embodyiiigfzmotlier form of theimeiitioii, 'find pjiiifticiiliiiiyillristiiiting `the 'inodicotion'fof" the iiriiioji inI section. For the sek-e' of cleoriiess all ,said giires ore represented upon ii relatively large scale. 4 -f l Referring `to Figs. l and i),

A boing anyelectriezil conductors, one or iiioi-e in number, und .B the insulation tlici'coi", tlio :i'riiior'is composed ot tivo-spirally wound. metal strips, C and D respectively. Said inner stri!) (l is formed in any suitable niaiiiner with longi-" tiidinel oorifiigiitions, o-A-b-f-zyseid corrugzi` tion bbeing in etcct :i liiiiil between seid coiriigziti'ons `af. Said inner strip Gis. Spiral v Woiiiitltiglitly iip'oii said insulation B, .find so :is to leave open slits or joints l/ init of bending or deieci'iiig tlieA armored 10F: conductor iis occasion may require ii'licrimin stelling flic sinne. Outside oi" siiifl inner strip (l is spit-:illy wound tlie ont-ci' strip D, so iis to coi/ei.' tlie aforesaid slit 5,', und the curviitiires of said strip li) ind the said cor'I rugzitioiis a-a, nfs ivell :is the ciiivaitiirc of thecoiifiigzition l) of siiiil strip (l, :ire siicli 'that' said-strip D has4 a'true and smooth Working fit on said strip C, so4 that said .strips may move relatively to ea'ch other,

Whenever the armored conducto` is bent or deflected, smoothly and Without either strip catching on or scratching or injuringfth'e other strip; and said outer strip D is 'of such Width, and is so positioned on saidinner strip C, that it can move thereon with Iproper freedom when tt 'e armored conductor is bent or deflected.

Referring to Fig. 8, A being the conductors and B the insulation, the yinner strip of armor, CQ'may, if desired, be of the same iorm as is shown in Figs. 1 and 2, and with the ead b and corrugations a-a as shown. But the-outer str1 D of said armor is formed with a lip or corrugation e at one side ofthe fcorriigation d', and said outer strip D is 'wrapped spirally outside of saidinne'r strip C 1n such position that the said corrugation d covers the slit g between the adjacent edges of said inner strip C and the said lip e" partly covers the bead b of said inner strip,

and both the: said strips C', Df, are so shaped that said outer st rip D. hasva true smooth working fit von said inner strip as. shown in yFi 3- and hereinbefore explained, and it wi l be understood that the vsaid slit g and the slit 1L, between theadjacentedges of the outer strip, will be of suiiicient Width to permit of any desired deflection of the armored conductor.' It will be seen that the construction illustrated inFig. Siprovidesja double armor at'every point, except at the narrow slits,.and therefore affords additional protection against inJiiry to the insulation, from nails, rodents and other causes.

Now" having described iny improvements l ,claim as my invention.

In an armored conductor, a flexible protective covering for the insulation consisting i of twov metallic strips, the inner ofsaid strips being corrugated and beaded longitudinally 46 and the outer lofsaid strips having a longitudiiial corrugat'ion of relatively greater Width and lip of -relatively less Width adapted to true and smooth working fit on the corugations and beads of said inner strip and over the joint between the adjacent edges of said inner' strip,-substantially as described. .A j u 2. In an armored conductor, a flexible protective covering for the insulation consisting of two longitudinally corrugatedl metal strips arranged one on the other so as to con stitute practically a double armor, the' inner strip beingA provided with relatively Wide corugations and relatively narrow)7 beads between said corrugations and the outer stripv having a smooth true Working lit on the corrugations of the inner strip, substantially as.'

described.

3. In an armored conductor, the combination of a flexible galvanized metallic innerr tubular strip provided With relatively Wide corrugations and relatively Anarron7 lbeads between said corrugations, and a flexible galvanized metallic outer tubular strip proyvided with corrugations fitting smoothly ion" said relatively Wide corrngations of said Iinner strip, substantially as described. I

4. In an armored conductor, the combination of a flexible galvanized metallic in iier tubular strip provided with relatively Wide corrugations and relatively narrow beads between said corrugations, and a liexible galaov vanized metallic outer tubular strip pro-jl Witnesses: i

H. V. BROWN, n WALTER N. HARRIS. 

